JPH08137922A - Text editor - Google Patents

Abstract

PURPOSE: To reduce errors to be generated in grammar check. CONSTITUTION: Information for extracting a signal name in a signal-substituted document as an object to be checked is set up in a definition file 4. A preparator inputs a signal name registering table 5b and a function describing document 5a in which the specifications of syntax elements are registered from an input device 1. An arithmetic processing unit(APU) 2 extracts a signal name to be checked from the message 5a based upon the contents of a file 4 and stores the extracted signal name in a signal name table 5d together with the information of the table 5b. Then error check is executed based upon the contents of the table 5d and the checked result is displayed on an output device 6. Thereby the preparator can execute necessary correction by returning a text editor to an edition mode.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a text editor, and more particularly to a text editor for a CAD system for inputting a hardware description language representing the function of an electronic circuit such as an LSI.

[0002]

2. Description of the Related Art Conventionally, in inputting and editing a hardware description language that represents the function of an electronic circuit such as an LSI, a text (hereinafter referred to as a function description sentence) described in the hardware description language is first Input and edit with a text editor that does not have information about the structure of the language, execute a dedicated application program that can read this language, perform a grammar check to find the grammatically incorrect part, and make an erroneous description. It was fixed with a text editor.

In the above-mentioned function description sentence, for example, a signal substitution sentence for inputting a signal from the input terminal of the electronic circuit to the inside of the circuit, and conversely for outputting a signal from the inside of the electronic circuit to the output terminal of the circuit. There are signal assignment statements, etc. In addition, in this signal assignment statement, a signal name that is a variable corresponding to each input / output terminal (hereinafter, referred to as an external signal name) and a signal name that is a variable used for signal propagation inside the electronic circuit ( Hereinafter, the internal signal name) is included.

By the way, a creator who creates a function description sentence with a text editor inputs a sentence by considering the propagation of a signal in an electronic circuit in mind. An error occurred that made a description that violates the specifications of the assignment statement. Then, the sentence in which such an error occurs becomes a signal assignment sentence in which a signal cannot be propagated. In the conventional input editing work, all the function description sentences are input and then a dedicated application program is executed to check the grammar, so if there are a large number of the above errors in the function description sentences, these errors will occur. It will be detected as it is by the grammar check.

[0005]

As described above, in the conventional input editing work, if there are a large number of errors in the function description sentence, the syntax check by the application program and the text editor are used to correct these errors. Since the correction work must be repeated, there has been a problem that the number of man-hours for the input editing work increases remarkably. There is also a problem that the larger the scale of the function description sentence, the more the number of signal names used in the function description sentence and the more errors. The present invention has been made to solve the above problems, and an object of the present invention is to provide a text editor that can reduce errors that occur in a grammar check by an application program.

[0006]

According to the present invention, there is provided an input device for inputting a function description statement described in a hardware description language, and a registration table for registering specifications of syntax elements constituting the function description statement. , Output device for displaying the result of input / edit processing, definition file with information for extracting syntax elements to be checked, and syntax elements to be checked from the input function description Based on the definition file, performs an error check of the extracted syntax element based on the registration table, and displays an error message according to the result of this check on the output device.

In the definition file, the signal name in the signal substitution statement for signal propagation is used as a syntax element to be checked, and information for extracting this signal name is set. The signal name in the signal substitution statement is extracted from the description statement based on the definition file, and error checking of the extracted signal name is performed based on the registration table in which the signal name and its additional information are registered as syntax element specifications. is there. In addition, the processing unit has an area for inputting / displaying the registration table, an area for displaying the definition file, an area for inputting / editing function description text, or displaying an error message, and error checking. A screen having an area for displaying a check command for instructing the start of the check command is displayed on the output device, and the error check is started when the check command is input.

[0008]

According to the present invention, the arithmetic processing unit extracts the syntax element to be checked from the input function description sentence based on the definition file, and performs the error check of this syntax element based on the registration table. Can detect an error in the function description sentence.

Further, the arithmetic processing unit extracts the signal name in the signal assignment statement from the function description statement based on the definition file,
By performing an error check on the extracted signal name based on the registration table in which the signal name and its additional information are registered as the specification of the syntax element, an error in the signal name and the signal substitution statement can be found. In addition, the arithmetic processing unit has an area for inputting / displaying a registration table, an area for displaying a definition file, an area for inputting / editing a function description sentence or displaying an error message, and a check command. By displaying on the output device a screen having an area for display of, the input / editing work can be performed on the screen of the output device.

[0010]

1 is a block diagram of a text editor showing an embodiment of the present invention, and FIG. 2 is a flow chart for explaining the operation of the text editor. Reference numeral 1 is a function description sentence described in a hardware description language, and an input device for inputting a registration table for registering specifications of syntax elements forming the function description sentence. Reference numeral 2 is a function description input by the input device 1. It is an arithmetic processing device that extracts a syntax element to be checked from a sentence, performs an error check, and displays an error message according to the result of the check on an output device described later.

Further, 3 is a program memory for storing a program for causing the arithmetic processing unit 2 to execute the operation of this embodiment, and 4 is a definition file in which information for extracting syntax elements to be checked is set. 5 is an input device 1
A function description sentence and a signal name registration table input from the data memory, a data memory for storing an assignment statement table and a signal name table, which will be described later, and an output device 6 for displaying the result of the input / edit processing.

Further, 5a is a function description statement stored in the data memory 5, 5b is a signal name registration table in which signal names and their additional information are registered as specifications of syntax elements, and 5c is extracted from the function description statement 5a. An assignment statement table 5d which is a set of signal assignment statements is a signal name table which is a set of signal names extracted from the signal assignment statements in the assignment statement table 5c.

Next, as an operation of such a text editor, an operation in an edit mode for inputting / editing a function description sentence will be described with reference to FIG. The arithmetic processing unit 2 controls the edit mode according to the program stored in the program memory 3. First, the arithmetic processing unit 2 causes the output unit 6 such as a CRT display unit to display an edit screen as shown in FIG. 3 (step 10).
0).

In FIG. 3, 20 is a signal name area for inputting / displaying the contents of the signal name registration table 5b in the editing screen, 21 is a setting area for displaying the contents of the definition file 4, and 22 is a setting area. A character string input area for inputting / displaying the function description 5a, 23 is a check command for instructing the start of error checking, and 24 is a cursor.

In the definition file 4, information for extracting syntax elements to be checked (signal assignment statement and signal name in this embodiment) is set. As the information, as shown in the area 21 of FIG. 3, a symbol “<=” is set as information for recognizing whether it is a check target syntax element (signal assignment statement), and a syntax including this symbol is set. As information on which of the elements is to be checked, both sides of the symbol are set to be checked. Also,
It is set that the right side (R) of the symbol is the substitution side and the left side (L) is the substitution side.

Then, the creator operates the arrow keys of the input device 1 such as a keyboard to move the cursor 24 and operates each key of the device 1 to make a desired input at the position of the cursor 24. It can be carried out. In step 100, the signal name registration table 5
Since b and the function description 5a have not been input yet, only the setting area 21 and the command 23 are actually displayed, and the signal name area 20 and the character string input area 22 are blank.

Subsequently, the arithmetic processing unit 2 uses the cursor 24.
Is in the position of the command 23 (step 101). If it is not in the position of the command 23, step 1
Proceed to 02 to wait for input from the creator. Next, the creator operates the input device 1 to move the cursor 24 to the signal name area 2
It is moved to 0 and the signal name registration table 5b is input (step 102).

The arithmetic processing unit 2 outputs the input signal name registration table 5b to the output unit 6 for display and stores it in the data memory 5 (step 103).
Thus, the contents of the signal name registration table 5b are displayed in the area 20 of FIG. Signal name registration table 5b
Includes a signal name and, as additional information thereof, type information indicating whether the signal name is an external signal name or an internal signal name, and type information indicating a data type of the signal name.

For example, as shown in FIG. 3, the signal name "DA
The type information of "TA" is "in", which indicates that this is an external signal name related to the input terminal. Also, "int" of the type information indicates that it is an integer type. Similarly, the signal name “001” has type information “ou”.
“T” indicates that this is an external signal name related to the output terminal. Further, the signal name “INF” has a blank type information, which indicates that it is an internal signal name, and the type information “char” indicates a character type.

Next, the creator operates the input device 1 to move the cursor 24 to the character string input area 22, and inputs the function description sentence 5a (step 104). The arithmetic processing unit 2 displays the input function description sentence 5a on the output unit 6 and stores it in the data memory 5 (step 105). Thus, the content of the function description sentence 5a is displayed in the area 22 of FIG.

"30, 35-3 in the area 22 of FIG.
"7" is a line number, and the function description is shown after the line number. After repeating such an input operation as needed, the creator moves the cursor 24 to the position of the check command 23 and presses the line feed key of the input device 1. As a result, since the determinations at steps 101 and 106 are both Yes, the processing unit 2 proceeds to step 107 to enter the check mode operation.

When the check mode is entered, the arithmetic processing unit 2
Performs the following operation according to the program stored in the program memory 3. 4A and 4B are diagrams showing the configurations of the assignment statement table 5c and the signal name table 5d created in the data memory 5 in this check mode.

First, the processor 2 defines the definition file 4
The function description sentence 5a in the data memory 5 is searched based on the above, the signal assignment statement is extracted and stored in the assignment statement table 5c of the data memory 5 (step 107). In the present embodiment, “<=” is registered in the definition file 4 as a symbol for recognizing that it is a signal assignment statement, so a statement including the symbol “<=” is extracted as a signal assignment statement.

Therefore, from the function description sentence such as the area 22 in FIG. 3, "DATA <= WRK;", "INF <= WRK"
The signal substitution statement "+001;", ... Is extracted and stored in the substitution statement table 5c as shown in FIG. Next, the processor 2 again defines the definition file 4
To extract the signal name to be checked from the assignment statement table 5c and store it in the signal name table 5d together with the information in the signal name registration table 5b (step 108). Then, the contents of this signal name table 5d An error check is performed based on (step 109).

In this embodiment, since the definition file 4 registers that both sides of the symbol “<=” are to be checked, the signal names on both sides of the symbol “<=” are extracted and shown in FIG.
It is stored in the item 40 of (b). Further, it is stored in the item 41 whether the signal name is on the right or left side of the symbol, and the type information of the signal name is taken out from the signal name registration table 5b and stored in the item 42. The item 43 is an item indicating error information, and its initial value is “000”.

Therefore, from the first signal assignment statement "DATA <= WRK;" in the assignment statement table 5c, the signal name "WR
“K” and “DATA” are taken out and stored in the item 40 as shown in FIG. The signal name "WRK" has the symbol "<
Since it was on the right side of “=”, “R” is stored in the item 41. Since the type information indicates the internal signal name in the signal name registration file 5b, the item 42 is also blank. Since the signal name “WRK” has no error described later, the value of the item 43 remains “000”.

The next signal name "DATA" is the symbol "<="
"L" is stored in the item 41 because it was on the left side of.
And since the type information is "in",
The item 42 is also “in”. Here, the external signal name related to the input terminal is given to the corresponding input terminal, and the signal substitution statement including this external signal name is from the input terminal (substitution side) to the inside of the electronic circuit (substitution side). It is for inputting a signal to. That is, the type information "in" defines the specification that the signal name having this type information should not be on the substituting side.

In the present embodiment, the left side of the symbol is set as the substituting side. Therefore, the extracted signal name "DATA" is on the left side (L) of the symbol, which violates the above specifications registered in the signal name registration table 5b. In the error check in step 109, the arithmetic processing unit 2 determines that such an error is an error, and sets the value of the item 43 from “000” to “01”.
Change to "0".

Then, the arithmetic processing unit 2 creates the signal name table 5d as described above (step 108) and performs error checking (step 109) until all the signal names have been checked (step 110). Repeat for each sentence. From the next signal assignment statement “INT <= WRK + 001;” stored in the assignment statement table 5c, the signal name “I
"NT", "WRK", and "001" are extracted, and the same processing as above is performed.

At this time, the signal name "001" has the type information "out" registered in the signal name registration table 5b. Here, the external signal name relating to the output terminal is given to the corresponding output terminal, and the signal substitution statement including this external signal name is output from the inside (substitution side) of the electronic circuit to the output terminal (substitution side). It is for outputting a signal to.
That is, the type information "out" defines the specification that the signal name having this type information should not be on the substitution side.

In this embodiment, the right side of the symbol is set as the substitution side. Therefore, the extracted signal name "0
Since "01" was on the right side (R) of the symbol, it would violate the above specifications registered in the signal name registration table 5b. The arithmetic processing unit 2 detects such an error at the time of error check of the signal name “001”, and the item 43
The value of is changed from "000" to "010".

Further, the same processing is repeated to obtain the signal name "WW" from the signal substitution statement "WWRK <= SIG2 * MOD;".
Since the signal name "WWRK" is not registered in the signal name registration table 5b when "RK" is extracted, the arithmetic processing unit 2 determines that there is an error and changes the value of the item 43 from "000" to "001". To do. In this way, when all the signal names have been checked (step 110), the result is displayed in the character string input area 22 of the output device 6 as follows.

FIG. 5 is a diagram showing a state of an error message displayed on the output device 6. In the arithmetic processing unit 2, the value of the item 43 is “00” in the created signal name table 5d.
A signal name which is not "0", that is, a signal name in which an error has occurred is taken out (step 111), and is displayed on the output device 6 together with the line number in the function description sentence 5a of this signal name and an error message according to the content of the error (step 111). 11
2).

The content of the error can be understood from the position of "1" in the value of the item 43. In this embodiment, "001" indicates that the signal name registration table 5b is not registered, and "010" indicates the table 5b. It shows an error that violates the specifications of. The arithmetic processing unit 2 thus discriminates the content of the error based on the value of the item 43 and displays an error message according to the content.

For example, as shown in FIG. 5, the signal name "DA
For “TA”, “001”, and “002”, the error message “Substitution not possible” is displayed and the signal name “WW
For "RK", an error message "Unregistered" is displayed. The above error message display is repeated for each signal name, and when the display of all messages is completed (step 111), the check mode is completed.
In this way, the author can recognize the signal assignment statement and signal name in which the error occurred and can return the text editor to edit mode to make the necessary corrections.

[0036]

According to the present invention, a definition file in which information for extracting a syntax element to be checked is set, and a registration table for registering specifications of syntax elements forming a function description sentence are prepared. As a result, the arithmetic processing unit extracts syntax elements from the function description sentence and performs error checking, which makes it easy to detect and correct an error in the function description sentence at an early stage. Can be reduced,
It is not necessary to repeat the grammar check by the application program and the correction work by the text editor, and the man-hours of the input editing work can be reduced.

A definition file in which information for extracting the signal name in the signal assignment statement as a syntax element to be checked is set, and a registration table in which the signal name and its additional information are registered as syntax element specifications are prepared. By doing
The arithmetic processing unit extracts the signal name from the function description and performs error checking, so it is easy to find and correct an error in the description of the signal name or a description that violates the specifications of the signal name and the signal substitution statement early. Becomes

Further, the arithmetic processing unit has an area for inputting / displaying a registration table, an area for displaying a definition file, and an area for inputting / editing a function description sentence or displaying an error message. Since the screen having the area for displaying the check command is displayed on the output device, the input / edit work and the check work can be easily performed on the screen of the output device.

[Brief description of drawings]

FIG. 1 is a block diagram of a text editor showing an embodiment of the present invention.

FIG. 2 is a flowchart for explaining the operation of the text editor of FIG.

FIG. 3 is a diagram showing a state of an edit screen displayed on an output device.

FIG. 4 is a diagram showing configurations of an assignment statement table and a signal name table created in a data memory.

FIG. 5 is a diagram showing a state of an error message displayed on the output device.

[Explanation of symbols]

1 ... Input device, 2 ... Arithmetic processing device, 3 ... Program memory, 4 ... Definition file, 5 ... Data memory, 5a ... Function description sentence, 5b ... Signal name registration table, 5c ... Assignment statement table, 5d ... Signal name table , 6 ... Output device.

Claims (3)

[Claims] 1. In a text editor for inputting / editing a hardware description language, for inputting a registration table for registering a specification of a function description statement described in the language and syntax elements constituting the function description statement. Input device, an output device for displaying the results of input / edit processing, a definition file that contains information for extracting the syntax elements that should be checked, and a check target from the input function description And a processing unit that causes an error message according to the result of this check to be displayed on the output device. A text editor characterized by having. 2. The text editor according to claim 1, wherein in the definition file, a signal name in a signal substitution statement for signal propagation is used as a check target syntax element, and information for extracting the signal name is set. The arithmetic processing unit extracts the signal name in the signal substitution statement from the function description statement based on the definition file, based on the registration table in which the signal name and its additional information are registered as the specifications of the syntax element, A text editor characterized by performing an error check on the extracted signal name. 3. The text editor according to claim 1, wherein the arithmetic processing unit has an area for inputting / displaying the registration table, an area for displaying the definition file, and an input of the function description sentence. When a screen having an area for editing or displaying an error message and an area for displaying a check command for instructing the start of the error check is displayed on the output device, and a check command is input A text editor for starting the error check.